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MAX4465EUK-T-MAX4466EUK-T-MAX4466EXK-T-MAX4467EKA-T-MAX4468EKA/T-MAX4468EKA-T-MAX4469EKA-T
Low-Cost / Micropower / SC70/SOT23-8 / Microphone Preamplifiers with Complete Shutdown
General DescriptionThe MAX4465–MAX4469 are micropower op amps opti-
mized for use as microphone preamplifiers. They pro-
vide the ideal combination of an optimized gain
bandwidth product vs. supply current, and low voltage
operation in ultra-small packages. The MAX4465/
MAX4467/MAX4469 are unity-gain stable and deliver a
200kHz gain bandwidth from only 24µA of supply cur-
rent. The MAX4466/MAX4468 are decompensated for a
minimum stable gain of +5V/V and provide a 600kHz
gain bandwidth product. In addition, these amplifiers
feature Rail-to-Rail®outputs, high AVOL,plus excellent
power-supply rejection and common-mode rejection
ratios for operation in noisy environments.
The MAX4467/MAX4468 include a complete shutdown
mode. In shutdown, the amplifiers’ supply current is
reduced to 5nA and the bias current to the external
microphone is cut off for ultimate power savings. The
single MAX4465/MAX4466 are offered in the ultra-small
5-pin SC70 package, while the single with shutdown
MAX4467/MAX4468 and dual MAX4469 are available in
the space-saving 8-pin SOT23 package.
ApplicationsMicrophone Preamplifiers
Hearing Aids
Cellular Phones
Voice-Recognition Systems
Digital Dictation Devices
Headsets
Portable Computing
Features+2.4V to +5.5V Supply Voltage OperationVersions with 5nA Complete Shutdown Available
(MAX4467/MAX4468)Excellent Power-Supply Rejection Ratio: 112dBExcellent Common-Mode Rejection Ratio: 126dBHigh AVOL: 125dB (RL= 100kΩ)Rail-to-Rail OutputsLow 24µA Quiescent Supply Current Gain Bandwidth Product:
200kHz (MAX4465/MAX4467/MAX4469)
600kHz AV≥
5 (MAX4466/MAX4468)Available in Space-Saving Packages
5-Pin SC70 (MAX4465/MAX4466)
8-Pin SOT23 (MAX4467/MAX4468/MAX4469)
MAX4465–MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown19-1950; Rev 1; 4/01
Ordering InformationRail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
Pin Configurations
Typical Operating Circuit
MAX4465–MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage (VCCto GND)................................................+6V
All Other Pins to GND.................................-0.3V to (VCC+ 0.3V)
Output Short-Circuit Duration
OUT Shorted to GND or VCC.................................Continuous
Continuous Power Dissipation (TA= +70°C)
5-Pin SC70 (derate 2.5mW/°C above +70°C).............200mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW
8-Pin SOT23 (derate 5.3mW/°C above +70°C)...........421mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VCC= +5V, VCM= 0, VOUT= VCC/2, RL= ∞to VCC/2, SHDN = GND (MAX4467/MAX4468 only). TA= TMINto TMAX, unless otherwise
noted. Typical values specified at TA= +25°C.) (Note 1)
MAX4465–MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete ShutdownMAX4465/MAX4467/MAX4469
GAIN AND PHASE vs. FREQUENCY (NO LOAD)
FREQUENCY (Hz)0.11k10k100k101001M
GAIN (dB)/PHASE (DEGREES)
MAX4465-69 toc01
MAX4466/MAX4468 GAIN AND PHASE
vs. FREQUENCY (NO LOAD)
FREQUENCY (Hz)
GAIN (dB)/PHASE (DEGREES)
MAX4465-69 toc021k10k100k101001M
MAX4465/MAX4467/MAX4469
GAIN AND PHASE vs. FREQUENCY (CL = 100pF)
FREQUENCY (Hz)0.11k10k100k101001M
GAIN (dB)/PHASE (DEGREES)
MAX4465-69 toc03
Note 1:All specifications are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2:Shutdown mode is available only on the MAX4467/MAX4468.
Note 3:External feedback networks not considered.
ELECTRICAL CHARACTERISTICS (continued)(VCC= +5V, VCM= 0, VOUT= VCC/2, RL= ∞to VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= TMINto TMAX, unless otherwise
noted. Typical values specified at TA= +25°C.) (Note 1)
ypical Operating Characteristics(VCC= +5V, VCM= 0, VOUT= VCC/2, RL= 100kΩto VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= +25°C, unless otherwise
noted.)
MAX4465–MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYFREQUENCY (Hz)1k10k100k1001M
PSRR (dB)
-30MAX4465-69 toc04
10,000
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4465-69 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (pA)
SUPPLY CURRENT vs. TEMPERATURE
MAX4465-69 toc06
TEMPERATURE (°C)
SUPPLY CURRENT (
OUTPUT LEAKAGE CURRENT
vs. TEMPERATURE
MAX4465-69 toc07
TEMPERATURE (°C)
ILEAK
(pA)
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
MAX4465-69 toc08
FREQUENCY (kHz)
CHANNEL-TO-CHANNEL ISOLATION (dB)
MAX4465-69 toc09
TEMPERATURE (°C)
INPUT OFFSET VOLTAGE
vs. TEMPERATUREMAX4465-69 toc10
TEMPERATURE (°C)
- V
OUT
(mV)
OUTPUT VOLTAGE SWING HIGH
vs. TEMPERATUREMAX4465-69 toc11
TEMPERATURE (°C)
OUT
- V
(mV)
OUTPUT VOLTAGE SWING LOW
vs. TEMPERATUREMAX4465-69 toc12
TEMPERATURE (°C)
CMRR (dB)
COMMON-MODE REJECTION RATIO
vs. TEMPERATURE
Typical Operating Characteristics (continued)(VCC= +5V, VCM= 0, VOUT= VCC/2, RL= 100kΩto VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= +25°C, unless otherwise
noted.)
MAX4465–MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete ShutdownLARGE-SIGNAL GAIN
vs. OUTPUT VOLTAGE
MAX4465-69 toc13
VOUT (V)
GAIN (dB)
MAX4465-69 toc14
TEMPERATURE (°C)
GAIN (dB)
LARGE-SIGNAL GAIN
vs. TEMPERATUREMAX4465-69 toc15
TEMPERATURE (°C)
MIN
(V)
MINIMUM OPERATING VOLTAGE
vs. TEMPERATURE0.0012k20k200
MAX4465/MAX4467/MAX4469
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCYMAX4465-69 toc16
FREQUENCY (Hz)
THD + N (%)
MAX4465-69 toc17
FREQUENCY (Hz)
THD + N (%)
0.0012k20020k
MAX4466/MAX4468
TOTAL HARMONIC DISTORTION
vs. FREQUENCYTHD + N (%)
MAX4465/MAX4467/MAX4469
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT AMPLITUDE
MAX4465-69 toc18
VIN (Vp-p)
MAX4465-69 toc19
VIN (Vp-p)
THD + N (%)
MAX4466/MAX4468
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT AMPLITUDE20µs/div
NONINVERTING SMALL-SIGNAL
TRANSIENT RESPONSEMAX4465-69 toc20
50mV/div
Typical Operating Characteristics (continued)(VCC= +5V, VCM= 0, VOUT= VCC/2, RL= 100kΩto VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= +25°C, unless otherwise
noted.)
MAX4465–MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
Typical Operating Characteristics (continued)(VCC= +5V, VCM= 0, VOUT= VCC/2, RL= 100kΩto VCC/2, SHDN = GND (MAX4467/MAX4468 only), TA= +25°C, unless otherwise
noted.)
SINK CURRENT vs. OUTPUT VOLTAGEMAX4465-69 toc24
OUTPUT VOLTAGE (V)
SINK CURRENT (mA)1.01.50.52.02.53.0
SOURCE CURRENT vs. OUTPUT VOLTAGEMAX4465-69 toc25
OUTPUT VOLTAGE (V)
SOURCE CURRENT (mA)1.01.50.52.02.53.0
( ) denotes S0T23 package of the MAX4467/MAX4468
MAX4465–MAX4469
Low-Cost, Micropower, SC70/SOT23-8, Microphone
Preamplifiers with Complete Shutdown
Detailed DescriptionThe MAX4465–MAX4469 are low-power, micropower op
amps designed to be used as microphone preampli-
fiers. These preamplifiers are an excellent choice for
noisy environments because of their high common-
mode rejection and excellent power-supply rejection
ratios. They operate from a single +2.4V to +5.5V sup-
ply.
The MAX4465/MAX4467/MAX4469 are unity-gain stable
and deliver a 200kHz gain bandwidth from only 24µA of
supply current. The MAX4466/MAX4468 have a mini-
mum stable gain of +5V/V while providing a 600kHz
gain bandwidth product.
The MAX4467/MAX4468 feature a complete shutdown,
which is active-high, and a shutdown-controlled output
providing bias to the microphone. The MAX4465/
MAX4467/MAX4469 feature a slew rate suited to voice
channel applications. The MAX4466/MAX4468 can be
used for full-range audio, e.g., PC99 inputs.
Rail-to-Rail Output StageThe MAX4465–MAX4469 can drive a 10kΩload and still
typically swing within 16mV of the supply rails. Figure 1
shows the output voltage swing of the MAX4465 config-
ured with AV= +10.
Switched Bias SupplyWhen used as a microphone amplifier for an electret
microphone, some form of DC bias for the microphone
is necessary. The MAX4467/MAX4468 have the ability to
turn off the bias to the microphone when the device is in
shutdown. This can save several hundred microamps of
supply current, which can be significant in low power
applications. The MIC_BIAS pin provides a switched
version of VCCto the bias components. Figure 3 shows
some typical values.
Driving Capacitive LoadsDriving a capacitive load can cause instability in many
op amps, especially those with low quiescent current.
The MAX4465/MAX4467/MAX4469 are unity-gain stable
for a range of capacitive loads up to 100pF. Figure 4
shows the response of the MAX4465 with an excessive
capacitive load.
Applications Information
Shutdown ModeThe MAX4467 and MAX4468 feature a low-power, com-
plete shutdown mode. When SHDN goes high, the sup-
ply current drops to 5nA, the output enters a high
impedance state and the bias current to the microphone
is switched off. Pull SHDN low to enable the amplifier.
Do not leave SHDN floating. Figure 5 shows the shut-
down waveform.
Common-Mode Rejection RatioA microphone preamplifier ideally only amplifies the sig-
nal present on its input and converts it to a voltage
appearing at the output. When used in noninverting
mode, there is a small output voltage fluctuation when
both inputs experience the same voltage change in the
